Details

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1.Introduction



The CRE, CRIE and CRNE pumps are based on the CR, CRI and CRN pumps.
CRE, CRIE and CRNE pumps belong to the so-called Epump family and are referred to as E-pumps.
The difference between the CR and CRE pump ranges is the motor.
E-pumps are fitted with an E-motor, meaning a motor with a built-in frequency converter.
The E-pump motor is a Grundfos MGE motor designed to meet EN standards.
The built-in frequency converter enables continuous variable control of the motor speed.
This means that the pump can be set to operation at any duty point. The purpose of continuous variable speed control of the motor speed is to adjust the performance to a given requirement.
E-pumps are available with an integrated pressure sensor connected to the frequency converter that functions as a feedback sensor for constant pressure control.
In new installations, the E-pumps provide a number of advantages. The built-in frequency converter has a built-in motor protection function which protects both motor and electronics against overload.
This means that E-pump installations do not require a motor-protective circuit breaker, but only a normal shortcircuit protection for the cable. The pump materials are identical to those of the CR, CRI and CRN pump ranges.

Examples of E-pump applications
E-pumps are the ideal choice for a number of applications characterized by a demand for variable flow at constant pressure. The pumps are suited for water supply systems and pressure boosting as well as for industrial applications.
Depending on the application, the pumps offer energy savings, increased comfort and improved processing.

E-pumps in the industry market
The industry market uses a large number of pumps in many different applications. Demands on pumps in terms of pump performance and mode of operation make speed control a must in many applications.
Some of the applications in which E-pumps are often used are listed below.

Constant pressure
• Water supply
• washing and cleaning systems
• distribution from waterworks
• humidifying systems
• water treatment systems
• process boosting systems.
Example: Within industrial water supply, E-pumps with an integrated pressure sensor are used to ensure a constant pressure in the pipe system. From the feedback sensor, the E-pump receives inputs about changes of pressure as
a result of changes in the consumption. The E-pump responds to the input by adjusting the speed until the pressure is equalized. The constant pressure is stabilized once more on the basis of a preset setpoint.

Constant temperature
• Air-conditioning systems at industrial plants
• industrial cooling systems
• industrial freezing systems
• casting and moulding tools.
Example: In industrial freezing systems, E-pumps with a temperature sensor increase the comfort and lower the operating costs compared with pumps without a feedback temperature sensor.
An E-pump continuously adapts its performance to the changing demands reflected in the differences in temperature of the liquid circulating in the freezing system. Thus, the lower the demand for cooling, the maller the quantity of liquid circulated in the system and vice versa.

Constant level
• Boiler feed systems
• condensate systems
• sprinkler irrigation systems
• chemical industry.
Example: In a steam boiler, it is important to be able to monitor and control the pump operation to maintain a constant level of water in the boiler.
By using an E-pump with a level sensor in the boiler, it is possible to maintain a constant water level.
A constant water level ensures an optimum and costefficient operation as a result of a stable steam production.

Dosing applications
• Chemical industry, meaning control of pH values
• petrochemical industry
• paint industry
• degreasing systems
• bleaching systems.
Example: In the petrochemical industry, E-pumps with a pressure sensor are used as dosing pumps.

The E-pumps help to ensure that the correct mixture ratio is achieved when more liquids are combined.
E-pumps functioning as dosing pumps improve processing and offer energy savings.

E-pumps in commercial building market
The commercial building market use E-pumps to maintain a constant pressure or a constant temperature based on a variable flow.

Constant pressure
• Water supply in high-rise buildings, such as office buildings and hotels.

E-pumps with a pressure sensor are used for water supply in high-rise buildings to ensure a constant pressure even at the highest draw-off point. As the consumption pattern and thus the pressure changes during the day, the
E-pump continuously adapts its performance until the pressure is equalized.

Constant temperature
• Air-conditioning systems in hotels and schools
• building cooling systems.
Example: E-pumps are an excellent choice for buildings where a constant temperature is essential. E-pumps keep the temperature constant in air-conditioned, high-rise glass buildings, irrespective of the seasonal fluctuations of
the outdoor temperature and various heat impacts inside the building.

When to select an E-pump
Select an E-pump if the following is required:
• controlled operation, that is the consumption fluctuates
• constant pressure
• communication with the pump.
Adaptation of performance through frequency-controlled speed control offers obvious benefits, such as the following:
• energy savings
• increased comfort
• control and monitoring of the pump performance.

Components of a Grundfos E-pump
An E-pump is not just a pump, but a system which is able to solve application problems or save energy in a variety of pump installations. All that is required is the power supply connection and the fitting of the E-pump in the pipe
system, and the pump is ready for operation. The pump has been tested and pre-configured from the factory. The operator only has to specify the desired setpoint (pressure) and the system is operational.

E-pumps with and without a sensor
CRE, CRIE and CRNE pumps are available with a pressure sensor enabling the control of the pressure on the pump outlet side. The E-pump is also available without a sensor.
The purpose of supplying CRE, CRIE and CRNE pumps with a pressure sensor is to make the installation and startup simple and quick.
Generally, E-pumps without a sensor are used when uncontrolled (open loop) operation is required or when there is a wish to fit a sensor at a later stage to enable the following:
• pressure control
• flow control
• level control of liquid in a tank
• temperature control
• differential pressure control
• differential temperature control.

E-pumps without a sensor are also used when a remote analog signal is connected to the setpoint input terminal.
For further information, see the section on control modes. ErP compliant
The product is energy-optimized and complies with the ecodesign requirements for water pumps specified in the ErP Directive (Commission Regulation (EC) No 547/2012), which became effective on 1 January 2013. As from this date, all pumps are classified and graduated in the Minimum Efficiency Index (MEI).

Minimum efficiency index
Minimum efficiency index (MEI) means the dimensionless scale unit for hydraulic pump efficiency at best efficiency point (BEP), part load (PL) and overload (OL). The Commission Regulation (EU) sets efficiency requirements
to MEI ≥ 0.10 as from 1 January 2013 and MEI ≥ 0.40 as from 1 January 2015. An indicative benchmark for bestperforming water pump available on the market as from 1 January 2013 is determined in the Commission Regulation.
• The benchmark for most efficient water pumps is MEI ≥ 0.70.
• The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy
consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
• The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable-speed drive that matches the pump duty to the system.
• Information on benchmark efficiency is available at http://europump.eu/efficiencycharts.



2. Applications
Water supply
Filtration and transfer at waterworks
Distribution from waterworks
Pressure boosting in mains
Pressure boosting in high-rise buildings, hotels
Pressure boosting for industrial water supply

Industry
Pressure boosting
Process-water systems
Washing and cleaning systems
Vehicle-washing tunnels
Firefighting systems

Liquid transfer
Cooling and air-conditioning systems (refrigerants)
Boiler feed and condensate systems
Machine tools (cooling lubricants)
Aquafarming

Special transfer duties
Oils and alcohols
Acids and alkalis
Glycol and coolants

Water treatment
Ultra-filtration systems
Reverse osmosis systems
Softening, ionising, demineralising systems
Distillation systems
Separators
Swimming baths

Irrigation
Field irrigation (flooding)
Sprinkler irrigation
Drip-feed irrigation

3.Features and benefits
Pump
The CR and CRE pumps are non-self-priming, vertical multistage centrifugal pumps.
The pumps are available with a Grundfos frequencycontrolled motor.
The pump consists of a pump head and a base.
The chamber stack and the sleeve are secured between the pump head and the base with staybolts. The base has inlet and outlet ports on the same level (in line). All pumps are fitted with a maintenance-free mechanical shaft seal of the cartridge type.



Motor
MGE motors
MGE motors incorporate thermal protection against slow
overload and blocking.
CRE, CRIE and CRNE pumps require no external motor
protection.
Frequency-controlled MGE motors
CRE, CRIE and CRNE pumps are fitted with a totally enclosed, fan-cooled, frequency-controlled MGE motor with principal dimensions to EN standards.
CRE, CRIE, CRNE pumps from 0.37 to 1.5 kW are available with single-phase MGE motors.
CRE, CRIE, CRNE pumps from 0.37 to 26 kW are available with three-phase MGE motors.

Bluetooth
For MGE motors from 3 to 26 kW, the product incorporates a Bluetooth (BLE) module for remote control. For MGE motors from 0.37 to 2.2 kW, see the
detailed description about Grundfos GO.
Via the built-in Bluetooth module, the product can communicate with the Grundfos GO. Bluetooth communication can take place at distances up to 10 metres.

Operating conditions
Pumped liquids
The pumps are designed to pump non-explosive liquids that do not chemically attack the pump materials.
When pumping liquids with a density and/or viscosity higher than that of water, oversized motors may be required.
Whether a pump is suitable for a particular liquid depends on several factors of which the most important are the chloride content, pH-value, temperature and content of chemicals and oils.
Please note that aggressive liquids may attack or dissolve the protective oxide film of the stainless steel and thus cause corrosion.

CRE and CRIE
The pumps are suitable for non-corrosive liquids.
Use them for liquid transfer, circulation and pressure boosting of cold or hot clean water.

CRNE
The pumps are suitable for industrial liquids.
Use them in systems where all parts in contact with the liquid must be made of high-grade stainless steel.

List of pumped liquids
A number of typical liquids are listed below.
Other pump versions may be applicable, but those stated in the list are considered to be the best choices.
The table is intended as a general guide only and cannot replace actual testing of the pumped liquids and pump materials under specific working conditions.
Therefore, use the list with some caution. Factors such as those mentioned below may affect the chemical resistance of a specific pump version:
• concentration of the pumped liquid
• liquid temperature
• pressure.


 

Pumped liquid	Chemical formula	Note	Liquid concentration, liquid temperature	CRE	CRNE
Acetic acid	CH3COOH	-	5 %, 20 °C	-	HQQE
Acetone	CH3COCH3	1, F	100 %, 20 °C	-	HQQE
Alkaline degreasing agent	-	D, F	-	HQQE	-
Ammonium bicarbonate	NH4HCO3	E	-	HQQE	-
Ammonium bicarbonate	NH4HCO3	E	20 %, 30 °C		HQQE
Ammonium hydroxide	NH4OH		20 %, 40 °C	HQQE	-
Aviation fuel	-	1, 3, 4, F	100 %, 20 °C	HQBV	-
Benzoic acid	C6H5COOH	H	0.5 %, 20 °C		HQQV
Boiler water	-	-	< 120 °C	HQQE
		F	120-180 °C
Calcareous water			< 90 °C	HQQE
Calcium acetate (as coolant with inhibitor)	Ca(CH3COO)2	D, E	30 %, 50 °C	HQQE
Calcium hydroxide	Ca (OH)2	E	Saturated solution, 50 °C	HQQE
Chloride-containing water	-	F	< 30 °C, maximum 500 ppm	-	HQQE
Chromic acid	H2CrO4	H	1 %, 20 °C	-	HQQV
Completely desalinated water (demineralised water)	-	-	120 °C	-	HQQE
Condensate	-	-	120 °C	HQQE	-
Copper sulphate	CuSO4	E	10 %, 50 °C	-	HQQE
Corn oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Diesel oil	-	2, 3, 4, F	100 %, 20 °C	HQBV	-
Domestic hot water (potable water)	-	-	< 120 °C	HQQE	-
Ethanol (ethyl alcohol)	C2H5OH	1, F	100 %, 20 °C	HQQE	-
Ethylene glycol	HOCH2CH2OH	D, E	50 %, 50 °C	HQQE	-
Formic acid	HCOOH	-	5 %, 20 °C	-	HQQE
Glycerine (glycerol)	OHCH2CH(OH)CH2OH	D, E	50 %, 50 °C	HQQE	-
Hydraulic oil (mineral)	-	E, 2, 3	100 %, 100 °C	HQQV	-
Hydraulic oil (synthetic)	-	E, 2, 3	100 %, 100 °C	HQQV	-
Isopropyl alcohol	CH3CHOHCH3	1, F	100 %, 20 °C	HQQE	-
Lactic acid	CH3CH(OH)COOH	E, H	10 %, 20 °C	-	HQQV
Linoleic acid	C17H31COOH	E, 3	100 %, 20 °C	HQQV	-
Methanol (methyl alcohol)	CH3OH	1, F	100 %, 20 °C	HQQE	-
Motor oil	-	E, 2, 3	100 %, 80 °C	HQQV	-
Naphthalene	C10H8	E, H	100 %, 80 °C	HQQV	-
Nitric acid	HNO3	F	1 %, 20 °C	-	HQQE
Oil-containing water	-	-	< 100 °C	HQQV	-
Olive oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Oxalic acid	(COOH)2	H	1 %, 20 °C	-	HQQE
Ozone-containing water	(O3)	-	< 100 °C	-	HQQE
Peanut oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Petrol	-	1, 3, 4, F	100 %, 20 °C	HQBV	-
Phosphoric acid	H3PO4	E	20 %, 20 °C	-	HQQE
Propanol	C3H7OH	1, F	100 %, 20 °C	HQQE	-
Propylene glycol	CH3CH(OH)CH2OH	D, E	50 %, < 90 °C	HQQE	-
Potassium carbonate	K2CO3	E	20 %, 50 °C	HQQE	-
Potassium formate (as coolant with inhibitor)	KOOCH	D, E	30 %, 50 °C	HQQE	-
Potassium hydroxide	KOH	E	20 %, 50 °C	-	HQQE
Potassium permanganate	KMnO4	-	5 %, 20 °C	-	HQQE
Rape seed oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Salicylic acid	C6H4(OH)COOH	H	0.1 %, 20 °C	-	HQQE
Silicone oil	-	E, 3	100%	HQQV	-
Sodium bicarbonate	NaHCO3	E	10 %, 60 °C	-	HQQE
Sodium chloride (as coolant)	NaCl	D, E	30 %, < 5 °C, pH > 8	HQQE	-
Sodium hydroxide	NaOH	E	20 %, 50 °C	-	HQQE
Sodium hypochlorite	NaOCl	F	0.1 %, 20 °C	-	HQQV
Sodium nitrate	NaNO3	E	10 %, 60 °C	-	HQQE
Sodium phosphate	Na3PO4	E, H	10 %, 60 °C	-	HQQE
Sodium sulphate	Na2SO4	E, H	10 %, 60 °C	-	HQQE
Softened water	-	-	< 120 °C	-	HQQE
Soya oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Sulphuric acid	H2SO4	F	1 %, 20 °C	-	HQQV
Sulphurous acid	H2SO3	-	1 %, 20 °C	-	HQQE
Unsalted swimming-pool water	-	-	Approx. 2 ppm free chlorine (Cl2)	HQQE	-
Pumped liquid	Chemical formula	Note	Liquid concentration, liquid temperature	CRE	CRNE
Acetic acid	CH3COOH	-	5 %, 20 °C	-	HQQE
Acetone	CH3COCH3	1, F	100 %, 20 °C	-	HQQE
Alkaline degreasing agent	-	D, F	-	HQQE	-
Ammonium bicarbonate	NH4HCO3	E	-	HQQE	-
Ammonium bicarbonate	NH4HCO3	E	20 %, 30 °C		HQQE
Ammonium hydroxide	NH4OH		20 %, 40 °C	HQQE	-
Aviation fuel	-	1, 3, 4, F	100 %, 20 °C	HQBV	-
Benzoic acid	C6H5COOH	H	0.5 %, 20 °C		HQQV
Boiler water	-	-	< 120 °C	HQQE
		F	120-180 °C
Calcareous water			< 90 °C	HQQE
Calcium acetate (as coolant with inhibitor)	Ca(CH3COO)2	D, E	30 %, 50 °C	HQQE
Calcium hydroxide	Ca (OH)2	E	Saturated solution, 50 °C	HQQE
Chloride-containing water	-	F	< 30 °C, maximum 500 ppm	-	HQQE
Chromic acid	H2CrO4	H	1 %, 20 °C	-	HQQV
Completely desalinated water (demineralised water)	-	-	120 °C	-	HQQE
Condensate	-	-	120 °C	HQQE	-
Copper sulphate	CuSO4	E	10 %, 50 °C	-	HQQE
Corn oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Diesel oil	-	2, 3, 4, F	100 %, 20 °C	HQBV	-
Domestic hot water (potable water)	-	-	< 120 °C	HQQE	-
Ethanol (ethyl alcohol)	C2H5OH	1, F	100 %, 20 °C	HQQE	-
Ethylene glycol	HOCH2CH2OH	D, E	50 %, 50 °C	HQQE	-
Formic acid	HCOOH	-	5 %, 20 °C	-	HQQE
Glycerine (glycerol)	OHCH2CH(OH)CH2OH	D, E	50 %, 50 °C	HQQE	-
Hydraulic oil (mineral)	-	E, 2, 3	100 %, 100 °C	HQQV	-
Hydraulic oil (synthetic)	-	E, 2, 3	100 %, 100 °C	HQQV	-
Isopropyl alcohol	CH3CHOHCH3	1, F	100 %, 20 °C	HQQE	-
Lactic acid	CH3CH(OH)COOH	E, H	10 %, 20 °C	-	HQQV
Linoleic acid	C17H31COOH	E, 3	100 %, 20 °C	HQQV	-
Methanol (methyl alcohol)	CH3OH	1, F	100 %, 20 °C	HQQE	-
Motor oil	-	E, 2, 3	100 %, 80 °C	HQQV	-
Naphthalene	C10H8	E, H	100 %, 80 °C	HQQV	-
Nitric acid	HNO3	F	1 %, 20 °C	-	HQQE
Oil-containing water	-	-	< 100 °C	HQQV	-
Olive oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Oxalic acid	(COOH)2	H	1 %, 20 °C	-	HQQE
Ozone-containing water	(O3)	-	< 100 °C	-	HQQE
Peanut oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Petrol	-	1, 3, 4, F	100 %, 20 °C	HQBV	-
Phosphoric acid	H3PO4	E	20 %, 20 °C	-	HQQE
Propanol	C3H7OH	1, F	100 %, 20 °C	HQQE	-
Propylene glycol	CH3CH(OH)CH2OH	D, E	50 %, < 90 °C	HQQE	-
Potassium carbonate	K2CO3	E	20 %, 50 °C	HQQE	-
Potassium formate (as coolant with inhibitor)	KOOCH	D, E	30 %, 50 °C	HQQE	-
Potassium hydroxide	KOH	E	20 %, 50 °C	-	HQQE
Potassium permanganate	KMnO4	-	5 %, 20 °C	-	HQQE
Rape seed oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Salicylic acid	C6H4(OH)COOH	H	0.1 %, 20 °C	-	HQQE
Silicone oil	-	E, 3	100%	HQQV	-
Sodium bicarbonate	NaHCO3	E	10 %, 60 °C	-	HQQE
Sodium chloride (as coolant)	NaCl	D, E	30 %, < 5 °C, pH > 8	HQQE	-
Sodium hydroxide	NaOH	E	20 %, 50 °C	-	HQQE
Sodium hypochlorite	NaOCl	F	0.1 %, 20 °C	-	HQQV
Sodium nitrate	NaNO3	E	10 %, 60 °C	-	HQQE
Sodium phosphate	Na3PO4	E, H	10 %, 60 °C	-	HQQE
Sodium sulphate	Na2SO4	E, H	10 %, 60 °C	-	HQQE
Softened water	-	-	< 120 °C	-	HQQE
Soya oil	-	D, E, 3	100 %, 80 °C	HQQV	-
Sulphuric acid	H2SO4	F	1 %, 20 °C	-	HQQV
Sulphurous acid	H2SO3	-	1 %, 20 °C	-	HQQE
Unsalted swimming-pool water	-	-	Approx. 2 ppm free chlorine (Cl2)	HQQE	-

Viscosity
The pumping of liquids with densities or kinematic viscosities higher than those of water will cause a considerable pressure drop, a drop in the hydraulic performance and a rise in power consumption.
In such situations, the pump must be fitted with a larger motor.